納米多孔表面高熱流密度下傳熱特性研究
[Abstract]:With the rapid development of microelectronic technology, the main frequency and integration of electronic components are becoming higher and higher, which leads to a sharp increase in power consumption and heat production of electronic components per unit area. If these heat can not be lost in time, the device temperature will rise gradually, which will affect its performance and service life. Therefore, the thermal barrier of electronic components has become one of the bottlenecks restricting the development of high integrated electronic components. The traditional cooling methods, such as air cooling, can no longer meet the requirements of heat dissipation of microelectronic components under high heat flux. In this paper, the enhancement of phase change heat transfer is considered as the research content, and the technology of micro-fabrication and anodic oxidation is adopted. Microgrooves and nano-porous heat transfer surfaces with different sizes were prepared and the heat transfer characteristics of various surfaces were studied. The results show that the morphology of nano-porous surface will be different under different anodizing conditions, which will affect the heat transfer performance of nano-porous surface. In this paper, with oxalic acid as electrolyte and controlling temperature at 40V 10oC voltage, nano-porous films with about 80nm pore size and array distribution can be successfully prepared. With phosphoric acid as electrolyte, the diameter of nano-pore increases to about 200nm when the temperature is controlled at 85V of 10oC, and there is fusion crosslinking between pore and pore. The existence of nano-pores can be used as the core of vaporization on the one hand, and increase the heat transfer area on the other. The experimental results of heat transfer on nano-porous surface show that the bubble with small diameter and high frequency has higher heat transfer coefficient, especially at high heat flux, the enhancement effect of heat transfer is more obvious. Compared with the surface of the microgroove group, the heat transfer coefficient is smaller when the heat flux is relatively low, and the heat transfer coefficient increases rapidly with the increase of the heat flux. In order to improve the critical heat flux, the surface of micro-nano composite structure is proposed in this paper. The experimental results show that the surface heat transfer effect of micro / nano composite structure is better than that of nano porous surface and micro groove group surface. Under the same experimental conditions, the heat transfer coefficient is twice that of the smooth surface.
【學位授予單位】:河北工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TK124
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